
3.3GHz to 3.9GHz
Wireless Broadband RF Transceiver
AC ELECTRICAL CHARACTERISTICS—Tx MODE
(MAX2838 Evaluation Kit, V CC _ = 2.8V, T A = +25°C, f RF = 3.601GHz , f LO = 3.6GHz. f REF = 40MHz, ENABLE = CS = high, and RXTX
= SCLK = DIN = low, with power matching for the differential RF pins using the Typical Operating Circuit. Lowpass filter is set to
7MHz RF channel BW, 90mV RMS sine and cosine signal (or 90mV RMS 64QAM 1024-FFT OFDMA FUSC I/Q signals wherever OFDM
is mentioned) applied to baseband I/Q inputs of transmitter (differential DC-coupled). Registers set to recommended settings and
corresponding test mode, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
TRANSMIT SECTION: Tx BASEBAND I/Q INPUTS TO RF OUTPUTS
RF Output Frequency Range
Peak-to-Peak Gain Variation over
RF Band
Total Voltage Gain
Maximum Output Power over
Frequency
RF Output Return Loss
RF Gain Control Range
RF Gain Control Binary Weights
Unwanted Sideband Suppression
Carrier Leakage
Tx I/Q Input Impedance (R || C)
Baseband Frequency Response
for 7MHz RF Channel BW
Baseband Group Delay Ripple
Maximum gain; at unbalanced 50 Ω matched output
OFDM signal conforming to spectral emission mask and
-36dB EVM after I/Q imbalance calibration by modem (Note 3)
All gain settings
B1
B2
B3
B4
B5
B6
Without calibration by modem, and excludes modem I/Q
imbalance; P OUT = 0dBm
Relative to 0dBm output power; without calibration by modem
Minimum differential resistance
Maximum differential capacitance
0 to 4.67MHz
At > 13.23MHz
0 to 4.9MHz (BW = 7MHz)
3.3
2.6
8
0
7
60
1
2
4
8
16
32
-40
-40
60
0.5
-8
-45
15
3.9
GHz
dB
dB
dBm
dB
dB
dB
dBc
dBc
k Ω
pF
dB
ns P-P
AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS
(MAX2838 Evaluation Kit, V CC = 2.8V, T A = +25°C, f LO = 3.6GHz, f REF = 40MHz, CS = high, SCLK = DIN = low, PLL loop bandwidth
= 180kHz, charge-pump comparison frequency = 40MHz, T A = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
FREQUENCY SYNTHESIZER
RF Channel Center Frequency
Channel Center Frequency
Programming Minimum Step Size
Charge-Pump Comparison
Frequency
3.3
11
29
40
3.9
GHz
Hz
MHz
Reference Frequency Range
Reference Frequency Input Levels
AC-coupled to REFCLK pin
11
800
40
80
MHz
mV P-P
6
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